Alert archive / Michigan / Freeze Watches in 2021
Freeze Watch 1, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this freeze watch at Apr 19, 2021, 3:42 AM EDT for 19 counties in Michigan. It took effect at Apr 20, 2021, 8:00 PM EDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Apr 19, 2021, 3:42 AM EDT (07:42 UTC)
- In effect from
- Apr 20, 2021, 8:00 PM EDT
- Expired
- Apr 19, 2021, 3:30 PM EDT
- In force
- Issued by
- NWS Grand Rapids, MI
Counties Allegan County, MI, Barry County, MI, Calhoun County, MI, Clinton County, MI, Eaton County, MI, Gratiot County, MI, Ingham County, MI, Ionia County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lake County, MI, Mason County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oceana County, MI, Ottawa County, MI, Van Buren County, MI
The radar
The Grand Rapids radar (KGRR), 11 km from the middle of the area, began a volume at 07:40 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Detroit, MI (KDTX), launched 00:00Z, 7.7 hours before the alert went out and 166 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 11 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 2298 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- -36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this freeze watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Rapids, MI wrote its last area forecast discussion before this freeze watch went out at Apr 18, 6:57 PM EDT, 8 hours 45 minutes earlier.
Area forecast discussion, Apr 18, 6:57 PM EDT, 8 hours 45 minutes before
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</html>Hazardous weather outlook, Apr 18, 7:00 PM EDT, 8 hours 42 minutes before
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</html>The office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 3:42 AM EDT | Freeze Warning | GRR | Lake, Mason, Newaygo, Oceana | 28 hr |
| Apr 19, 3:30 PM EDT | Freeze Warning | GRR | Allegan, Barry, Calhoun, Clinton, Eaton, Gratiot and 13 more | 66 hr |
Nearby
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.